CVE-2026-91994 Semaphore UI through 2.19.12 Missing Authorization on GET and HEAD Requests
Attackers with guest or task_runner roles can read all project environments including plaintext secrets via GET requests due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91994?
CVE-2026-91994 is a high-severity missing authorization vulnerability in semaphoreui semaphore, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Semaphore UI through 2.19.12 exempts GET and HEAD requests from project resource permission checks in GetMustCanMiddleware. Attackers with guest or task_runner roles can read all project environments including plaintext secrets, credentials, and passwords via GET requests to the environment endpoint.
Weakness: CWE-862
Which versions are affected by CVE-2026-91994?
How do I fix CVE-2026-91994?
No fix has been published for CVE-2026-91994 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-91994 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91994 exists.
Sources
Also known as GHSA-rvf3-c57p-p58j.